/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.webapi.controller;

import static org.hisp.dhis.webapi.utils.ContextUtils.setNoStore;
import static org.springframework.http.MediaType.APPLICATION_JSON_VALUE;

import jakarta.servlet.http.HttpServletResponse;
import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;
import java.util.concurrent.ExecutionException;
import org.hisp.dhis.cache.Cache;
import org.hisp.dhis.cache.CacheProvider;
import org.hisp.dhis.common.OpenApi;
import org.hisp.dhis.dxf2.webmessage.WebMessageException;
import org.hisp.dhis.external.conf.DhisConfigurationProvider;
import org.hisp.dhis.external.conf.model.GoogleAccessToken;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * @author Lars Helge Overland
 */
@OpenApi.Document(
    entity = Server.class,
    classifiers = {"team:platform", "purpose:support"})
@Controller
@RequestMapping("/api/tokens")
public class TokenController {

  private static final String TOKEN_CACHE_KEY = "keyGoogleAccessToken";

  private final Cache<GoogleAccessToken> tokenCache;

  private final DhisConfigurationProvider config;

  public TokenController(DhisConfigurationProvider config, CacheProvider cacheProvider) {
    this.config = config;
    this.tokenCache = cacheProvider.createGoogleAccessTokenCache();
  }

  @GetMapping(value = "/google", produces = APPLICATION_JSON_VALUE)
  public @ResponseBody GoogleAccessToken getEarthEngineToken(HttpServletResponse response)
      throws WebMessageException, ExecutionException {
    setNoStore(response);

    GoogleAccessToken token =
        tokenCache.get(TOKEN_CACHE_KEY, c -> config.getGoogleAccessToken().get());

    token.setExpiresInSeconds(
        ChronoUnit.SECONDS.between(LocalDateTime.now(), token.getExpiresOn()));

    return token;
  }
}
